含水率与含水饱和度直线模型的物理意义及变化特征

为了系统论述含水率fw与含水饱和度Sw直线模型截距a、斜率b的物理意义，利用大量试验资料分析了a和b的变化特征，认为斜率b可以作为直线模型的特征参数。分析表明，斜率b值的变化受试验温度、油水流体性质、岩石物理性质等基本条件的影响，随着试验温度的升高、原油粘度增大、油水界面张力减小，以及储层渗透率的增大、孔隙结构的变好，b值是逐渐减小的。以此认识为基础建立直线模型系数的经验方程，可以方便地计算残余油饱和度、水驱油效率，并计算不同含水阶段的剩余可动油饱和度，有利于正确评价水淹层。

The Physical Meaning and Variety Characteristic of the Linear Model of Water Cut and Water Saturation

To study the physical meaning of the intercept value and the slope value about the linear model of water cut and water saturation systemically,this paper uses many experimental data to analyze the variety feature of value a and value b.And think the value of the slope can be used as characteristic parameter of the linear model.The analysis shows that the values of slope are affected by the temperature of the experiment,fluid property and pertophysical property and so on.With the experiment temperature hoisting,the oil viscosity increasing,the strain of oil and water interface decreasingand the reservoir permeability increasing,the pore structure meliorating,the value of slope decrease.Base on these,the experimental equation of the linear model coefficient are built.Using the regional linear model,the residual oil saturation and water oil displacement under different economy condition can be calculated expediently.And the moveable residual oil saturation of the different phases can be calculated to evaluate the water flood layer accurately.